TWM475110U - Display device and information handling system - Google Patents

Abstract

A display device includes a plurality of video input interfaces and a display controller. The display controller is operable for determining whether a specified video input interface included by the plurality of video input interfaces is coupled to a video source. This is accomplished while scanning the plurality of video input interfaces in a predetermined order for a video signal. The display controller is also operable for determining whether the specified video input interface is receiving a video signal from the video source. This is accomplished in response to determining that the specified video input interface is coupled to a video source.

Description

Display device and information processing system

In general, the present invention relates to information processing systems ("IHS"), and more particularly to display devices coupled to IHS.

As the value of information and the use of information continue to increase, individuals and businesses seek other ways to process information and store information. One of the options is the Information Processing System ("IHS"). IHS typically processes, compiles, stores and/or communicates information or materials for corporate, personal or other purposes. As the needs and requirements of technical and information processing may vary from application to application, IHS can also handle what information, how it processes information, how much information is processed, stored or communicated, and the speed and efficiency of information processing, storage or communication. change. Changes in IHS allow IHS to become versatile, or IHS can be configured for special users or for specific uses, such as financial transaction processing, airline reservations, corporate data storage or global communications. In addition, IHS can include a variety of hardware components and software components that can be constructed to process, store, and communicate information, and can include one or more computer systems, data storage systems, and network systems.

A display device (eg, a projector, a liquid crystal display device, a cathode ray tube ("CRT") device, or a plasma display device) can be coupled to the IHS to display information (eg, a video signal) received from such IHS. In one example, the display device can receive video signals from more than one source. The display device includes a plurality of video input interfaces (eg, a digital video interface ("DVI"), an M1 analog ("M1-a") input interface, a component video interface, and a video graphics array ("VGA") interface.

Display devices including multiple video input interfaces may cause problems such as an increase in the amount of delay caused by the display device scanning the input signal.

There is a need for techniques and display devices that can reduce the amount of time to detect video signals without the disadvantages discussed above.

Thus, while scanning a plurality of video input interfaces in a predetermined order, a technique is provided for determining whether a particular video input interface included in the plurality of video input interfaces is coupled to a video source. In addition, in response to determining whether a particular video input interface is coupled to a video source, the technique provides for determining whether the particular video input interface receives a video signal from the video source.

4, 10‧‧‧ feet

100‧‧‧Information Processing System, IHS

105‧‧‧Processor

110‧‧‧Input device

115‧‧‧Display device

120‧‧‧Storage device

125‧‧‧ memory device

130‧‧‧Network Controller

200‧‧‧ display device

205‧‧‧ display controller

210, 215, 220, 225‧‧‧ video input interface

220‧‧‧M1-a video input interface

225‧‧‧VGA interface, ball grid array interface

305‧‧‧Resistors

315, 320‧‧‧ Grounding pins

405-420‧‧‧Steps

1 is a block diagram of an information processing system in accordance with an embodiment.

Fig. 2 is a block diagram showing a display device of the display device of Fig. 1.

FIG. 3 is a block diagram of determining whether a video source is coupled to a circuit of a video input interface, according to an embodiment.

Figure 4 is a flow chart showing the operation performed by the display device of Figure 2.

For the purposes of this disclosure, an information processing system ("IHS") can include any appliance or collection of appliances operable to operate, classify, process, transmit, receive, retrieve, source, exchange, store, display, Express, detect, record, reproduce, process or utilize any form of information, intelligence or materials for business, science, control, entertainment or other purposes. For example, IHS can be a personal computer, PDA, consumer electronics device, network server or storage device, switching router or other network communication device or any other suitable device, and vary in size, shape, performance, functionality, and price. The IHS can include memory, one or more processing resources such as a central processing unit ("CPU") or hardware control logic or software control logic. Additional components of the IHS include one or more storage devices, one or more communication ports for communicating with external devices, and various input and output (I/O) devices such as keyboards, mice, and video displays. The IHS also includes one or more bus bars operable to transmit communications between the various hardware components.

Figure 1 is a block diagram of an IHS according to this embodiment, generally indicating Is 100. The IHS 100 includes a processor 105 that executes or otherwise processes instructions, such as an Intel Pentium series processor, an input device 110 that receives information from a user, and displays information to a user. Display device 115 [such as a cathode ray tube ("CRT") device, a projector, a liquid crystal display ("LCD") device or a plasma display device], and a storage device 120 for storing information (for example, a non-electrical storage device such as a hard A disk drive or other computer readable medium or computer readable device), a memory device 125 for storing information (such as a random access memory ("RAM") device, and a read only memory ("ROM") The device] and the network controller 130 for communication between the IHS 100 and the network. The input device 110, the display device 115, the storage device 120, the memory device 125, and the network controller 130 are each coupled to the processor 105 and coupled to each other. In one example, IHS 100 includes a number of other electronic circuits that perform other operations of IHS 100, such as printing devices (e.g., inkjet printers and laser printers) for printing visually visible images onto paper.

Input device 110 includes, for example, a conventional keyboard and indicator device (eg, "mouse", trackball, or stylus). The user operates the keyboard to input textual text information into the processor 105, which receives such information from the keyboard. The user can operate the indicator device to input the cursor control information to the processor 105, and the processor 105 receives such cursor control information from the indicator device.

2 is a block diagram of a representative display device of display device 115 of FIG. 1, generally indicated at 200. Display device 200 includes a display controller 205. The display device 200 also includes video input interfaces 210, 215, 220, and 225, each of which is coupled to the display controller 205. In this particular embodiment, the various video input interfaces included in display device 200 are of a different type from each other. For example, the input interfaces 210, 215, 220 and 225 are respectively a digital video interface ("DVI"), a component video interface, an M1 analog ("M1-a") video interface, and a video graphics array ("VGA") interface. .

Through the various interfaces 210, 215, 220 and 225, the display device 200 can receive video signals, and the display device 200 can display information (such as video, video and text) in response to such video signals. In one example, display controller 205 determines display device by scanning video input interfaces 210, 215, 220, and 225 in a predetermined sequence in response to powering up display device 200 or recovering from a low power state (eg, a suspend mode). 200 whether to receive video signals (via The video signal is received by a video input interface included in the display device 200. However, if the video input source (eg, IHS 100) is coupled to a video input interface (eg, video input interface 220 or 225) that is subsequently scanned in a predetermined sequence, display device 200 is responsive to a delay associated with the scan, in response to Receiving a video signal from one of the video input sources to display information.

In another example, a user of an IHS (eg, a portable IHS, such as a laptop) can connect the IHS to the display device 200 as a secondary (eg, external) display device. In this case, after the display device 200 has scanned the video input interface to which the IHS is coupled, the user can allow the external video output of the IHS. When the display device 200 scans its other video input interface, the display device 200 does not display information on its screen. During this latency delay, the user may mistakenly believe that the user did not initially allow external video output and attempted to allow the IHS to perform external video output again. For multiple IHSs, a single command can switch between external video output and external video output. In this way, by attempting to enable the external video output for the second time, the user may accidentally output the external video. In this case, the user mistakenly believes that the IHS and/or display device 200 is defective.

The display controller 205 also determines whether a particular video input interface (eg, the video input interface 220 or 225) of the plurality of video input interfaces of the display device 200 is coupled to the video source when scanning the video interface of the display device 200 in a predetermined order. . In addition, in response to determining that the particular video input interface is coupled to the video source, the display controller 205 determines (eg, via interrupt scanning, and samples the particular video input interface to determine) whether the particular video input interface receives the video source. Video signal.

In one embodiment, the display controller 205 determines whether the particular video input interface is coupled to the video source in response to the interrupt signal. In one example, the display controller 205 determines that the particular video input interface is coupled to the video source in response to determining that the cable (eg, a video cable) is coupled to the particular video input interface. The display controller 205 determines the cable by determining whether the logic state of a pin included in the specific video input interface is changed from the first state to the second state (which will be described later in detail with reference to FIG. 3). Whether it is coupled to the specific video input interface.

Thus, Figure 3 is to determine whether a video source is coupled to a video input interface. The block diagram of the road. The circuit includes a resistor 305, and a supply voltage (e.g., 5 volts) to the resistor 305 and a voltage source of the circuit (e.g., a power rail).

As shown, resistor 305 is coupled to display controller 205. The resistor 305 is also coupled to a ground pin (eg, pin 10) 315 of the VGA interface 225. In this embodiment, resistor 305 is a "pull-up" resistor. Thus, the initial state of the pin 315 (eg, when the video interface 225 is not coupled to the video cable) is set to "high", and the display controller 205 detects this state. However, in response to the video cable being coupled to the video input interface 225, the logic state of the pin 315 changes from an initial high state to a low state. Thus, in response to the logic state of the decision pin 315 being low, the display controller 205 also determines that the video input interface 225 is coupled to a video source. In addition, display controller 205 samples the video input interface 225 for a video signal.

In another embodiment, resistor 305 is a "pull-down" resistor. Thus, the initial state of the pin 315 is not coupled to the video cable, and is set low, and the display controller 205 detects this state. In response to the video cable being coupled to the video input interface 225, the logic state of the pin 315 is changed from its initial low state to its high state. Thus, in response to determining that the logic state of the pin 315 is high, the display controller 205 also determines that the video input interface 225 is coupled to the video source through the video cable. In addition, display controller 205 samples video input interface 225 for video signals.

Referring again to FIG. 3, resistor 305 and display controller 205 are also coupled to ground pin 320 of M1-a video interface 220. As shown, for the M1-a video interface 220, the ground pin 320 is the pin 4. Display controller 205 detects the logic state of pin 320 in a manner similar to that in which display controller 205 detects the logic state of pin 315 as discussed above. As such, the display controller 205 determines that the video source is coupled to the video input interface 220 in response to determining that the state of the pin 315 changes from the first state (eg, the initial state) to the second state. As discussed above, for the embodiment where resistor 305 is a pull-up resistor, the first state is high and the second state is low. Conversely, for an embodiment where resistor 305 is a pull-down resistor, the first state is low and the second state is high.

Fig. 4 is a flow chart showing the operation performed by the display device 200 of Fig. 2. In this particular embodiment, such operation is performed via display controller 205 included in display device 200. The display device 200 can detect for a short time by performing the operations discussed later Video signal.

The operation begins in step 405 where display device 200 begins scanning a video signal of its video input interface. After step 405, the operation proceeds to step 410.

In step 410, when the video input interface is scanned, the display device 200 also determines whether a specific video input interface (such as a VGA interface or an M1-a interface) is coupled to the video source. In one example, as previously discussed, display device 200 makes this determination in response to an interrupt signal. After step 410, the operation continues to step 415.

In step 415, if the display device 200 determines that the specific video input interface is coupled to the video source, the operation proceeds to step 420. Otherwise the operation returns to step 410.

In step 420, the display device 200 determines whether a specific video input interface coupled to the video source receives an appropriate video signal, for example, by sampling a specific video input interface. In response to determining that the particular video input interface is receiving the appropriate video signal, display device 200 displays the information on the screen.

While the specific embodiments have been shown and described, the invention Moreover, in some instances certain features of the embodiments may be employed without the corresponding use of other features. The scope of the appended claims is to be interpreted broadly and interpreted in a manner that is in accordance with the scope of the embodiments disclosed herein.

100‧‧‧Information Processing System, IHS

105‧‧‧Processor

110‧‧‧Input device

115‧‧‧Display device

120‧‧‧Storage device

125‧‧‧ memory device

130‧‧‧Network Controller

Claims (13)

A display device comprising: a plurality of video input interfaces; and a display controller for performing the following actions: scanning the plurality of video input interfaces for a video signal in a predetermined order to detect a ground The logic state of the pin determines whether a particular video input interface included in the plurality of video input interfaces is coupled to the video source by determining an entity coupling of an input interface to a video source, wherein The logic state of the ground pin is configured to change from a first state to a second state when a video cable is coupled to the particular video input interface; and responsive to determining that the particular video input interface is coupled To the video source, an interrupt is initiated to suspend the scanning of the plurality of video input interfaces, and the specific video input interface is sampled to determine whether the particular video input interface receives a video signal from the video source. The display device of claim 1, wherein determining whether the particular video input interface receives a video signal from the video source comprises sampling for an appropriate video signal. The display device of claim 1, wherein determining whether the specific video input interface is coupled to the video source comprises determining whether the video cable is coupled to the specific video input interface. The display device of claim 3, wherein determining whether the video cable is coupled to the specific video input interface comprises: determining, in response to an interrupt signal, the video cable being coupled to the specific video input interface . The display device of claim 3, wherein determining whether the video cable is coupled to the specific video input interface comprises: responding to the logic state of the ground pin of the specific video input interface from the first The state changes to the second state, and the video cable is determined to be coupled to the specific video input interface. The display device of claim 5, comprising: a resistor coupled to the display controller and configured to set the first state. The display device of claim 6, wherein the resistor is a pull-up resistor, the first state is high, and the second state is low. The display device of claim 6, wherein the resistor is a pull-down resistor, the first state is low, and the second state is high. The display device of claim 5, wherein the specific video input interface is a video graphics array ("VGA") interface, and the ground pin is the pin 10. The display device of claim 5, wherein the specific video input interface is an M1-type analog ("M1-a") video interface, and the ground pin is pin 4. The display device of claim 1, wherein the plurality of video input interfaces comprise a digital video interface ("DVI"). The display device of claim 1, wherein the plurality of video input interfaces comprise a component video interface. An information processing system comprising: a processor; and a display device coupled to the processor, the display device comprising: a plurality of video input interfaces; and a display controller for performing the following actions: scanning the plurality of video input interfaces for a video signal in a predetermined order to detect a ground pin The logic state determines whether a particular video input interface included in the plurality of video input interfaces is coupled to the video source by determining an entity coupling of an input interface to a video source, wherein the ground connection The logic state of the foot is configured to change from a first state to a second state when a video cable is coupled to the particular video input interface; and responsive to determining that the particular video input interface is coupled to the video The source initiates an interrupt to suspend the scanning of the plurality of video input interfaces, and determines whether the specific video input interface receives a video signal from the video source by sampling the specific video input interface.